Kyren Legate 
Creature — Goblin
$0.29 #27873 0.06 26.9 years
If an opponent controls a Plains and you control a Mountain, you may cast this spell without paying its mana cost.
Haste
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Cards similar to Kyren Legate expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Massacre85%
$0.38↑#11461↑0.0626.6 years
"If an opponent controls a Plains and you control a Swamp, you may cast this spell without paying its mana cost."
Anger84%
$0.49↑#348↑0.40↑24.3 years↓
"Haste"
Mogg Salvage76%
$0.25↓#6601↑0.23↑26.6 years
"If an opponent controls an Island and you control a Mountain, you may cast this spell without paying its mana cost."
Marauding Knight71%
$0.62↑#268270.25↑25.9 years
"This creature gets +1/+1 for each Plains your opponents control."